An
asthma trigger is a factor that can lead to sudden
difficulty breathing or other symptoms of asthma (asthma attack).

Some triggers are substances a person may be allergic to (allergens). Allergens cause the body's natural
defenses (immune system) to produce chemicals called
immunoglobulin E (IgE) antibodies. These chemicals bind to allergens, causing
inflammation of the bronchial tubes, which carry air
to the lungs. The allergen may also cause asthma attacks. These triggers
include:

Pollen.

Dust mites.

Animal dander.

Cockroach droppings.

Mold.

Other triggers can cause asthma symptoms without affecting
the body's immune system. These include:

Cigarette smoke and air
pollution.

Viral infections, such as colds and
influenza, and sinus and other
upper respiratory infections.

Exercise.
Many people with asthma have symptoms when they exercise.

Dry, cold
air.

Medicines, such as aspirin or beta-blockers.

In
adults, hormones, including those involved in pregnancy and menstrual periods
(just before or during periods).

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